Why is this contest being run?
Who/what is Kalshi? (answered below)
LOL, complete with arbitration agreement and class action waiver.
I read the website as well as the terms of the challenge and that question is not answered by either.
Kalshi is the first CFTC regulated exchange dedicated to trading on a new asset class: event contracts. These contracts are structured as questions about whether a future event will happen and can be answered by a simple Yes or No.
Covering a wide range of topics from weather to international affairs to media and more, Kalshi’s event contracts allow you to capitalize on your opinion and hedge everyday risks."
https://kalshiexchange.zendesk.com/hc/en-us/articles/7351844...
https://kalshi.com/learn/what-is-event-contract
To try and answer your question - Probably to drum up business.